If you increase your activity level significantly, then you are, in a way, changing your diet.
That’s because caloric output is the other side of the coin of eating food, or, caloric input.
Food is energy, which you use, not only to live, but also, to play.
More practically speaking:
If you add one hour of intense physical activity per day, then that is a significant caloric demand on your body’s energy system, and you will either:
- Need to eat more to compensate and stay in balance, or
- Lose weight or muscle if you don’t adjust your food.
The real question is, where are you right now with your fat & muscle levels, before you make changes?
Wherever that it will determine what & how much more or less you should eat.
Matt Fried 